------------[ cut here ]------------
WARNING: kernel/rcu/srcutree.c:707 at cleanup_srcu_struct+0x350/0x744 kernel/rcu/srcutree.c:708, CPU#0: syz.1.1637/12066
Modules linked in:
CPU: 0 UID: 0 PID: 12066 Comm: syz.1.1637 Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026
pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : cleanup_srcu_struct+0x350/0x744 kernel/rcu/srcutree.c:708
lr : cleanup_srcu_struct+0x2f0/0x744 kernel/rcu/srcutree.c:706
sp : ffff8000942f79c0
x29: ffff8000942f79f0 x28: 1fffe0001917885f x27: 1ffff000110c1e4a
x26: dfff800000000000 x25: ffff80008977a960 x24: ffffffffffffffff
x23: ffff80008f4a5ba0 x22: ffff0000c8bc42f8 x21: fffffdffbf6a9340
x20: fffffdffbf6a9140 x19: 0000000000000000 x18: 1fffe000349f7028
x17: ffff80011b896000 x16: ffff80008f7c0000 x15: 0000000000000000
x14: 0000000000c1d7a5 x13: 0000000000000001 x12: 0000000000000003
x11: 0000000000000000 x10: 0000000000080000 x9 : 00000000000080f1
x8 : 0000000000000003 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000001 x4 : 0000000000000008 x3 : ffff8000805339e4
x2 : 0000000000000001 x1 : ffff0000f1c3d880 x0 : 0000000000000001
Call trace:
 cleanup_srcu_struct+0x350/0x744 kernel/rcu/srcutree.c:708 (P)
 blk_mq_free_tag_set+0x33c/0x438 block/blk-mq.c:4976
 loop_add+0x688/0x8e4 drivers/block/loop.c:2130
 loop_control_ioctl+0x138/0x510 drivers/block/loop.c:2243
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __arm64_sys_ioctl+0x154/0x1cc fs/ioctl.c:583
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606
irq event stamp: 413364
hardirqs last  enabled at (413363): [<ffff800086892474>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:210 [inline]
hardirqs last  enabled at (413363): [<ffff800086892474>] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:221
hardirqs last disabled at (413364): [<ffff80008686dffc>] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:483
softirqs last  enabled at (413088): [<ffff80008013aad4>] local_bh_enable include/linux/bottom_half.h:33 [inline]
softirqs last  enabled at (413088): [<ffff80008013aad4>] put_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:251 [inline]
softirqs last  enabled at (413088): [<ffff80008013aad4>] fpsimd_restore_current_state+0x39c/0x9c8 arch/arm64/kernel/fpsimd.c:1781
softirqs last disabled at (413086): [<ffff80008013a77c>] local_bh_disable include/linux/bottom_half.h:20 [inline]
softirqs last disabled at (413086): [<ffff80008013a77c>] get_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:234 [inline]
softirqs last disabled at (413086): [<ffff80008013a77c>] fpsimd_restore_current_state+0x44/0x9c8 arch/arm64/kernel/fpsimd.c:1774
---[ end trace 0000000000000000 ]---